diff --git a/src/game/ThreatManager.cpp b/src/game/ThreatManager.cpp
index 54dba3645e..7d486bc649 100644
--- a/src/game/ThreatManager.cpp
+++ b/src/game/ThreatManager.cpp
@@ -101,6 +101,9 @@ void HostileReference::fireStatusChanged(ThreatRefStatusChangeEvent& pThreatRefS
 
 void HostileReference::addThreat(float pMod)
 {
+    if (pMod + iThreat < 0)
+        pMod = -iThreat;
+
     iThreat += pMod;
     // the threat is changed. Source and target unit have to be availabe
     // if the link was cut before relink it again